Antisiphon device



Oct. 28, 1930. A. E. GRANT ANTISIPHON DEVICE Filed Sept.

////'/fi/%w/////////// INVENTOR. A/fierf E. Gram ing liquids from flowing from one point to Patented Oct. 1930 r I ALBERT E. GRANT, OF NEW Ionic,- my. Y

ANTISIPHON DEVICE Application filed September 29; 1927, Serial neg a'eaezs. v

My invention relates to meansfor preventa another by siphoning action.

The object of my invention is to provide simple and efficient means for preventing a liquid such as fuel oil, from flowing from one place to another by siphoning action.

My device is especially useful when installerlin oil burning systems where oil is drawn froma source of supply for use as a fuel, to prevent oil from escaping by siphoning action in the event of an-open valve .or

leakageat the point of discharge, after the pump in the systemrhas stopped itsoper'ation,

Referring to the drawings which form' a part of this specification: V

Fig. l is a plan view ofa' construction embodying my invention, hereinafter referred to as an anti-siphoning device. r

Fig. 2 is a vertical sectional view of the body portions of my device, and disclosing a helical tube D shown partly in section, in

closed in said body portion;

A, indicates the body portion of my device whichis preferably made of suitable, metal. The drawing discloses a construction drawn the full size of the device as generally made for use.

V B, indicates the inlet and C, the outlet for liquid. i

E, indicates a cylindrical chamber having a bore E in'which is fitted, the lower end of a tube D which closes the bore, and extends downward therefrom into the vertical portion of the conduit F, to a point below the longitudinally extending portion of the conduit F The upper portion of the tube D is formed in the shape of a helix to provide a long passage-way for the air, which restricts the rapid free flow of air thru the tube while still providing aconduit therethru having an area large enough to pass small particles of solid matter carried in the air, from lodging in the conduit and closing the same, thus rendering the device inoperative.

A small screen G is fitted across the top of the chamber E, and is of smaller mesh than that of the cross sectional area of the conduit, but the aggregate of the opening area thru the screen being greater than that of thenconduit." w r r r -It will be seen from the'above description that the invention embodies means for providing a long restricted passage of the charact'erdescribed, regardlessof the form of its cross section or the specific manner in which it may be constructed, so long as the air is properly restricted in its flow to accomplish its:functionfwheriahy valves for this purpose may be dispensed with.

The operation-of the device is as follows: Assuming the inlet B, to be positioned five feetabovethe' oilstorage reservoir, and connected therewith by a pipe to lead the oil to the conduit 1?, and a pipe connected to outlet C, and leading toa'pump located on a level below the oil storage reservoir. 7

The pump when operating, will draw. oil from the reservoir thru the conduit F and F and" discharge to aburner or otherplaco for use. The pump when first started will draw air thru the screen G and tube D until the oil from the reservoir rises above the lower end of thetube D,and practically closes the passage therethru so long as the oil is flowing upward thru the conduit F, but when the pump stops, and the oil is at rest, air willbe 1 drawn thru the tube D, and destroy the vacuum in the conduit F, and the oil therein will fiow'back into thereservoir, aswill be readily understood.

3 Having thus described my invention I claim as new: V q

a 1. An anti-siphon device comprising a body portion having a conduit for liquid formed therein, and having a chamber in 1 open communication with the atmosphere formed therein; and a relatively small helical conduit of restricted area for'air supported in said chamber, one end of which extends into said conduit for liquid and the other end of which is permanently in open communication with the atmosphere.

2. An anti-siphon device comprising a body portion having a conduit for liquid 7 formed therein, and having a chamber in open communication with the atmosphere formed therein; and a relatively small conduit for air supported in said chamber, one

end of which extends into said conduit for liquid and the other end of which is in open communication with the atmosphere and a fine mesh screen for" filtering the air prior to its passage thru the air conduit, located in the open end of said chamber.

3. An anti-siphon device comprising a body portion having a conduit for liquid formed therein and a relatively small helical tube for air, one end of which is in open connnunication with the said conduit in the body portion and the other end in permanent open communication with the atmosphere.

4:. A11 anti siphon device comprising a body portion having a conduit for liquid formed therein; and a relatively small tube of restricted area formed in a coil to restrict the passage of air therethru, one end of which is in open communication with the said conduit in the body portion and the other end in permanent open communication with the atmosphere.

5. An anti-siphon device comprising a body portion having a conduit for liquid formed therein, and a relatively small helical. conduit for air of restricted area, one end of which is inopen communication with the conduit for liquid and the other end of which is in permanent open communicationwith the atmosphere, and a fine mesh screen covering said air conduit, the interstices of which are of less area than that of the air conduit but the combinedarea of which is greatly in excess thereof.

6. An anti-siphon device comprising a body portion having an inlet and an outlet for fluid, a helical conduit for air, the lower end of which is located in said conduit for fluid at a point below the inlet thereto and its opposite end being in permanent open communication with the atmosphere, and a fine mesh screen covering said conduit for air.

In testimony whereof I have aflixed my signature.

ALBERT E. GRANT. 

